#header{
    height: 50px;
    line-height: 50px;
    text-align: center;
    margin: 0px auto;
    background-clip: border-box;
    background-color: #3e76e2
}
#footer{
    height: 50px;
    line-height: 50px;
    text-align: center;
    margin: 0px auto;
    background-clip: border-box;
    background-color: #e230d7
}

#content {
    height: 500px;
    text-align: center;
    margin: 0px auto;
    background-clip: border-box;
    background-color: #5adce2
}

.pic {
    height: 300px;
}